I come from a small town in New Hampshire, where I am the only one to go through both my elementary school and my highschool with CF, So I know what you mean about not being able to talk to many people with CF.
I have a group of probably 10 people that I'm really close with, and most of them know a pretty lot about CF, but they're basically the only ones who know the details. Many people in my school know that I have CF or at least cough alot, but I have always been very open about my CF, because my philosophy is, that my close friends already know all about it, so it doesn't really phase them to be honest, and if people have a question about why I'm coughing so much or something like that, then ask me, if you don't want to ask then stop staring. lol.
I also agree with lancestuart02 and think that if people can't accept me, with my CF (since it's obviously a big part of me) then i don't need them in my life. My friends and boyfriend have always been very supportive of me and the CF. Heck! They come and visit me while I'm in the hospital, even if it means that they have to wear masks whenever they leave my hospital room, and they even go outside with me (If I'm in a restaurant) to have a coughing fit. At first it's a bit embarassing but then they just get used to it I guess, and it doesn't bother them at all. They know that that is just how I am.
Hope that things work out for you!